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284 U.S. GOVERNMENT FILMS Repairing Structural Tubing U.S. Office of Education, 1945. (Aircraft Work Series. Aircraft Maintenance) Re- views material presented in motion pic- ture, same title. (OE 253; 47 frames) 41 Reproducers U.S. Department of the Navy, 1942. Con- struction and operation of headphones and loudspeakers. (SN 654; 29 frames) 41 Repulsion Motor Principles U.S. Office of Education, 1945. (Electri- cal Work Series. Electrical Machinery No. 5) Reviews material presented in motion picture, same title. (OE 387; 40 frames) 41 Repulsion-Induction Motor: General Overhaul U.S. Office of Education, 1945. (Electri- cal Work Series. Motor Maintenance and Repair No. 6) Reviews material pre- sented in motion picture, same title. (OE 397; 33 frames) 41 Rigging Blocks U.S. Department of the Navy, 1945. (Shipbuilding Skills Series. Rigging) Reviews material presented in motion picture, same title. (SN 2340-u; 57 frames) 41 Rigging Changes After Flight U.S. Department of the Navy, 1943. Con- struction faults revealed by test flights; tail, wing and nose heaviness; yawing; ground looping; how to make correc- tions. (SN 1999; 43 frames) 41 Ripping and Cross-Cutting U.S. Office of Education, 1945. (Preci- sion Wood Machining Series. Operations on the Variety Saw No. 1) Reviews ma- terial presented in motion picture, same title. (OE 306; 43 frames) . 41 Roadside Marketing U.S. Department of Agriculture, 1939. Several types of roadside stands; how to make stands attractive by location, display, signs, and advertising; charts on sales distribution in a day, by days of week, in a month, and by months in a year. Revision. (51 frames) 39 Rotating Magnetic Fields U.S. Office of Education, 1945. (Electri- cal Work Series. Electrical Machinery No. 2) Reviews material presented in motion picture, same title. (OE 384; 44 frames) 41 Rough Line-Boring U.S. Office of Education, 1945. (Machine Shop Work Series. Operations on the Horizontal Boring Mill No. 5) Reviews material presented in motion picture, same title. (OE 229; 31 frames) 41 Rough Turning Between Centers U.S. Office of Education, 1943. (Machine Shop Work Series. Operations on the Engine Lathe No. 1) Reviews material presented in motion picture, same title. (OE 6; 41 frames) 41 Rough-Facing, Boring, and Turning a Shoulder U.S. Office of Education, 1942. (Machine Shop Work Series. Operations on the Vertical Boring Mill No. 2) Reviews material presented in motion picture, same title. (OE 17; 47 frames) 41 Rough-Facing, Turning, and Drilling U.S. Office of Education, 1942. (Machine Shop Work Series. Operations on the Vertical Boring Mill No. 1) Reviews material presented in motion picture, same title. (OE 16; 49 frames) 41 Roughing-In Non-Metallic Sheathed Cable U.S. Office of Education, 1945. (Electri- cal Work Series. Wiring) Reviews ma-